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Full Backups only: When requirements guarantee backup protection up to the previous day, performing Full Backups nightly should be sufficient under the following conditions: |
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Full and Incremental Backups: When requirements guarantee data protection up to the previous day, backup time should be as fast as possible, and regular transaction log file truncation is required, Full Backups coupled with Incremental Backups is the best combination. |
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Full and Differential Backups: When requirements guarantee data protection up to the previous day, restore and backup time should be reasonably fast, and only occasional transaction log file truncation is required, Full Backups coupled with Differential Backups is the best combination. |
To create and use persistent snapshots, the data that you want to back up must reside on NetVault Backup-supported disk arrays. If you attempt to create persistent snapshots with data residing on an unsupported disk array, or with data residing in local drives (for which snapshots are taken using the Microsoft Software VSS Provider), taking the required hardware snapshots fails, and the plug-in defaults to using software snapshots. When taking software snapshots the data is only backed up to storage (even if the option Backup Files to Storage is not selected), and non-persistent snapshots are created.
The same issue occurs if your backup includes data that resides in different storage that mixes NetVault Backup-supported disk arrays and unsupported disk arrays or local drives. For example, if your backup includes five Exchange Mailbox Databases, for which three of the Mailbox Databases reside in different volumes in a NetVault Backup-supported disk array, and the other two Mailbox Databases reside in two different local drives on the Exchange Server, and you select Retain Snapshot as Persistent, taking hardware snapshots fails because all the Mailbox Databases do not reside on NetVault Backup-supported disk arrays. After failing to take the required hardware snapshots, the plug-in attempts to take software snapshots; if successful, the data is saved to NetVault Backup-managed storage, even if the option Backup Files to Storage was not selected.
For more information about NetVault Backup-supported OS versions and disk arrays, see the Quest NetVault Backup Compatibility Guide.
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